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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (Engine Controls Self-Diagnostics - 6.5L) >> Diagnostic Tests >> DTC P1635: 5-Volt Reference 1 Circuit >> Test Description

Test Description

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The numbers below refer to the step number in the diagnostic procedures.

  1. 2

    This step confirms whether a DTC is still present.

  2. 3

    This step determines if there is a 5-volt reference from the PCM.

  3. 4

    This step determines if there is a short to ground in the reference circuit or a short-to-ground in the PCM.

  4. 7

    This step determines if the short is being caused by one of the sensors or the short is in the wiring harness.

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